While "unlimited" mobile internet plans are common, you might have a limited data plan to save money with an MVNO. And there are other times when you need to watch how much data you use, like during international travel or when using a hotspot.
When you don't want your iPhone to gobble up data for every little task, you have several options to reduce what your device does on your mobile connection.
The easiest place to start is with a single toggle that lowers data consumption across everything your iPhone does. To access it, open Settings, then tap Cellular. If you have multiple SIMs, select the one you want to adjust. Then in the settings for it, hit Data Mode.
This will probably be set to Standard, which is good in most cases. Choose Low Data Mode instead, and your iPhone takes various actions to reduce data usage. These include streaming media (and video calls) in lower quality, turning off automatic updates and backups, and limiting how often feeds refresh. Try this when using a secondary eSIM in another country or anytime you need to preserve your data allotment for what you're actively doing.
For a less drastic approach, turn off Background App Refresh for apps that don't need to fetch new information while inactive. Visit Settings > General > Background App Refresh , where you can change the master option to Wi-Fi to avoid background refresh entirely on cellular data. Otherwise, leave it on for Wi-Fi and Cellular Data and disable the slider for any apps that don't need this feature.
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